CN1116731C - Method and device for suppressing ripples for high-power DC power supply - Google Patents
Method and device for suppressing ripples for high-power DC power supply Download PDFInfo
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- CN1116731C CN1116731C CN 00135473 CN00135473A CN1116731C CN 1116731 C CN1116731 C CN 1116731C CN 00135473 CN00135473 CN 00135473 CN 00135473 A CN00135473 A CN 00135473A CN 1116731 C CN1116731 C CN 1116731C
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Abstract
The present invention relates to a method and a device thereof for suppressing ripples for high-power DC power supplies. The device comprises a phase control rectifier whose output end is connected with the input end of a passive filter; a DC active filter is connected with loads in parallel, and is also connected with the output end of the passive filter in parallel; signals Uab inputted from the DC active filter are inputted into a low pass filter and a subtracter by a detection circuit for separating ripple voltage from DC; the ripple voltage is amplified by a proportional amplifier; PWM signals are generated by a tracking control circuit so that an inverter is amplified for generating corresponding ripple current signals; as a result, ripple current in a DC circuit is shunted for achieving the purpose of suppressing the ripple current and the voltage of the DC circuit.
Description
The invention belongs to electrical technology field, further relate to a kind of method and device that is used to suppress ripples for high-power DC power supply.
In proton-synchrotron in study of high energy physics, the magnet in the nuclear magnetic resonance device and the superconduction electrician Study on Technology, usually need supply with exciting current to magnet with the stabilized current power supply of big electric current, during these are used all the stability to magnetic field claim.Guarantee the long-term stability in magnetic field, will guarantee that exactly the output current of stabilized power supply has very high stability and extremely low ripple.Fast-pulse power supply in the heavy particle accelerator system of nuclear physics research, its electric current must accurately be followed the current impulse pattern that is provided by computer.These are used and not only require extremely low current ripples but also need response fast.
At present, the power of the DC stable power supply and the pulse power is increasing, and to up to ten thousand kilowatts, the phase control rectifier power supply remains the preferential selection that high-power stabilized power supply (as the magnet load) is used from hundreds of kilowatt.In order to satisfy strict output ripple requirement, adopt passive filter usually and adjust the output ripple that active filter that circuit constitutes is eliminated the phase control rectifier power supply by series connection is linear.Passive filter is bulky, and bigger passive filter will make the dynamic property of system and the tracking accuracy in the transient process worsen.Connect linear adjusting type active filter and load is connected in series, can reach higher quality index requests such as high stable, low ripple, low noise, but it is all limited that the current capacity and the linear amplification multiple of pipe (high power transistor) are adjusted in series connection, series connection adjustment is managed and often is made up of hundreds of high power transistors, and the loss that tube voltage drop causes is bigger.For high-power stabilized power supply, the problem of reducing the wastage is a very important problem.
Purpose of the present invention has proposed the structure of dc active power filter and passive filter formation hybrid filter of the parallel connection of a kind of employing PWM (pulse width modulation) technology control, adopt the control method that detects ripple voltage, make the current ripples of the high power DC stabilized power supply or the pulse power reach 10ppm (10
-5) below, the while has also been improved the stability of DC stable power supply.
For achieving the above object, technical scheme of the present invention is: it comprises a phase controlled rectifier, the output of phase controlled rectifier links to each other with the input of passive filter is in parallel, the output of passive filter and the input of active filter are connected in parallel, and the output and the load of active filter are connected in parallel;
The active filter control circuit comprises a testing circuit; testing circuit is connected on the input of low pass filter and the negative input end of subtracter respectively; the positive input terminal of the output termination subtracter of low pass filter; the input of the output termination proportional amplifier of subtracter; the input of the output termination PWM tracking control unit of proportional amplifier; the output of PWM tracking control unit is received the input of voltage source inverter, is connected to protector in the PWM tracking control unit.
Parallel active filter detects the method that suppresses the DC power supply ripple voltage: a, the b both end voltage U that at first detect active filter with detector
AbBe input to low pass filter then, through low pass filter and subtracter ripple voltage is separated from direct current, secondly, ripple voltage is amplified with proportional amplifier, as command signal, once more, command signal is produced pwm signal through tracking control unit, make inverter amplify the corresponding ripple current signal of generation and get final product.
Below in conjunction with accompanying drawing the present invention is described in further details.
Fig. 1 is an overall structure schematic diagram of the present invention.
Fig. 2 is a parallel active filter control circuit block diagram of the present invention.
Referring to Fig. 1, it comprises a phase controlled rectifier 1, the output of phase controlled rectifier 1 links to each other with the input of passive filter 2 is in parallel, and the input of the output of passive filter 2 and active filter 3 is connected in parallel, and the output of active filter 3 and load 4 are connected in parallel; Passive filter 2 comprises a capacitor C that is in series
d, and resistance R
d, the capacitor C of series connection
d, and resistance R
dAgain with capacitor C
rBe in parallel, and and inductance L
SBe in series; Active filter 3 comprises inductance L
A, inductance L
A withIncorporate circuit into after single-phase voltage bridge-type PWM inverter 5 is in series, also be parallel with control circuit 6 on the circuit, and the output of control circuit 6 is connected with the input of single-phase voltage bridge-type PWM inverter 5 again; Load 4 is by inductance L
LAnd resistance R
LBe connected in series.
Its operation principle is: at first 2 filtering obtain decay to the output ripple of phase controlled rectifier 1 through passive filter, and process active filter 3 further is inhibited the load end ripple and decays again, satisfies the requirement of load 4 low ripples.
Referring to Fig. 2, active filter control circuit 6 is by the detector 7 that contains transducer, low pass filter 8, subtracter 9, proportional amplifier 10, PWM tracking control unit 11, protector 12 is formed, annexation between them is: the input of active filter control circuit 6 is connected on the input of low pass filter 8 and the negative input end of subtracter 9 respectively by testing circuit 7, the positive input terminal of the output termination subtracter 9 of low pass filter 8, the input of the output termination proportional amplifier 10 of subtracter 9, the input of the output termination PWM tracking control unit 11 of proportional amplifier 10, the output of PWM tracking control unit 11 is received the input of voltage source inverter 5, is connected to protector 12 in PWM tracking control unit 11; It detects the method that suppresses the DC power supply ripple voltage: a, the b both end voltage U that at first detect active filter 3 with detector 7
Ab(including direct current and ripple composition), be input to low pass filter 8 then, through low pass filter 8 and subtracter 9 ripple voltage is separated from direct current, secondly, ripple voltage is amplified with proportional amplifier 10, as command signal, once more, command signal is produced pwm signal through follow-up control circuit 11, make inverter 5 amplify the corresponding ripple current signal of generation and get final product.By above method, make the ripple current shunting in the DC loop, reach the purpose that suppresses DC loop ripple current or voltage.
The dc active power filter of a kind of parallel connection that the present invention proposes and passive filter constitute the hybrid filter structure, and adopt the control method that detects ripple voltage, utilize the PWM technology, under the low-down situation of installation cost, can obtain good filter effect easily, the current ripples of high power DC stabilized power supply is reached below the 10ppm, also improved the stability of DC stable power supply simultaneously.Particularly invented and adopted the control method that detects ripple voltage, the remarkable advantage of this method is: under the not high situation of transducer and circuit element required precision, be easy to realize the low ripple requirement of DC stable power supply.This method realizes easily, and the device loss is little, the efficient height, and working stability, reliable has broad application prospects in the required high power DC stabilized current power supply and the pulse power aspect high-energy physics, superconduction research.
Claims (3)
1, a kind of device that is used to suppress ripples for high-power DC power supply, it comprises a phase controlled rectifier (1), it is characterized in that, the output of phase controlled rectifier (1) links to each other with the input of passive filter (2) is in parallel, the input of the output of passive filter (2) and active filter (3) is connected in parallel, and the output of active filter (3) and load (4) are connected in parallel; Passive filter (2) comprises a capacitor C that is in series
d, and resistance R
d, the capacitor C of series connection
d, and resistance R
dAgain with capacitor C
rBe in parallel, and and inductance L
SBe in series; Active filter (3) comprises inductance L
A, inductance L
AIncorporate circuit into after being in series with single-phase voltage bridge-type PWM inverter (5), also be parallel with control circuit (6) on the circuit, and the output of control circuit (6) is connected with the input of single-phase voltage bridge-type PWM inverter (5) again; Load (4) is by inductance L
LAnd resistance R
LBe connected in series.
2; the device that is used to suppress ripples for high-power DC power supply according to claim 1; it is characterized in that; active filter control circuit (6) comprises a testing circuit (7); testing circuit (7) is connected on the input of low pass filter (8) and the negative input end of subtracter (9) respectively; the positive input terminal of the output termination subtracter (9) of low pass filter (8); the input of the output termination proportional amplifier (10) of subtracter (9); the input of the output termination PWM follow-up control circuit (11) of proportional amplifier (10); the output of PWM follow-up control circuit (11) is received the input of voltage source inverter (5), is connected to protective circuit (12) in PWM follow-up control circuit (11).
3, according to claim 1, the method for 2 described inhibition ripples for high-power DC power supply is characterized in that, at first uses detector (7) to detect a, the b both end voltage U of active filter (3)
AbBe input to low pass filter (8) then, through low pass filter (8) and subtracter (9) ripple voltage is separated from direct current, secondly, ripple voltage is amplified with proportional amplifier (10), as command signal, once more, command signal is produced pwm signal through follow-up control circuit (11), make inverter (5) amplify the corresponding ripple current signal of generation and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00135473 CN1116731C (en) | 2000-12-28 | 2000-12-28 | Method and device for suppressing ripples for high-power DC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00135473 CN1116731C (en) | 2000-12-28 | 2000-12-28 | Method and device for suppressing ripples for high-power DC power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1301080A CN1301080A (en) | 2001-06-27 |
| CN1116731C true CN1116731C (en) | 2003-07-30 |
Family
ID=4596743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00135473 Expired - Fee Related CN1116731C (en) | 2000-12-28 | 2000-12-28 | Method and device for suppressing ripples for high-power DC power supply |
Country Status (1)
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| CN (1) | CN1116731C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421987B (en) * | 2001-11-22 | 2010-06-16 | 台达电子工业股份有限公司 | DC-to-AC voltage conversion circuit and its control method |
| CN1305195C (en) * | 2003-06-09 | 2007-03-14 | 清华大学 | Active power filtering method with inversing capacitor regulation and branch impendance controlled decoupling |
| US7586762B2 (en) * | 2006-12-12 | 2009-09-08 | O2Micro International Limited | Power supply circuit for LCD backlight and method thereof |
| CN101499657B (en) * | 2008-09-22 | 2014-03-12 | 王晓鹏 | Remote wired, wireless wideband network and electrical power system |
| CN102593869B (en) * | 2012-03-15 | 2014-10-29 | 东北大学 | H full-bridge conversion type micro-inverter grid connecting device |
| CN103076552B (en) * | 2012-03-23 | 2015-05-13 | 南京理工大学 | Method for inhibiting bias voltage ripples and line output amplifier channel non-uniformity |
| CN103001579B (en) * | 2012-11-16 | 2015-04-22 | 上海交通大学 | Direct-current active filter based on bidirectional DC-DC (direct current to direct current) converter |
| JP5975864B2 (en) * | 2012-12-18 | 2016-08-23 | 株式会社日立製作所 | Power converter |
| CN106483348A (en) * | 2016-12-19 | 2017-03-08 | 珠海格力电器股份有限公司 | Ripple detection circuit |
-
2000
- 2000-12-28 CN CN 00135473 patent/CN1116731C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1301080A (en) | 2001-06-27 |
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